ExternalInterface.available returns false on a Mac

Hi there!
I'm triyng to get the browsers back-button to work with my
flash site. The general principle is this:
There is an index.html page containing an (not yet) hidden
Iframe and the flash movie.
The Iframe contains page A, which starts with JavaScript
calling a BACK-function on the index-page.
The BACK-function triggers an AS-function in the flash-movie
that activates its own back-button, and then changes the URL of the
Iframe to Page B. This causes a new History to be added to the
browser.
The flash movie now contains 5 frames (labeled in the middle
of the stage) and two navigation buttons: back (Terug) and forward
(Verder). Those buttons do exactly what you'd expect them to do
(prevFrame and nextFrame).
On a PC (IE) this seems to work pretty well. But on a mac
nothing seems to work propperly.
I've got a testpage at:
http://www.multimediamatters.nl/test
Here's the code I have on the first frame.
stop();
_root.terug.onRelease = function(){
prevFrame();
terugF = function(){
trace(_root._currentframe);
if (_root._currentframe > 1){
_root.terug.onRelease();
else {
_root.getURL("javascript::history.go(-2)");
import flash.external.*;
var isAvailable:Boolean = ExternalInterface.available;
var txtField2:TextField = this.createTextField("txtField",
this.getNextHighestDepth(), 300, 0, 200, 50);
txtField2.border = true;
txtField2.text = "ExternalInterface.available =
"+isAvailable.toString();
var methodName:String = "goHome";
var instance:Object = null;
var method:Function = terugF;
var wasSuccessful:Boolean =
ExternalInterface.addCallback(methodName, instance, method);
var txtField:TextField = this.createTextField("txtField",
this.getNextHighestDepth(), 0, 0, 200, 50);
txtField.border = true;
txtField.text = "ExternalInterface.addCallback =
"+wasSuccessful.toString();
Somehow the ExternalInterface doesn't seem to get loaded. Any
suggestions to solve this?
Thanks in advance.
Yours,
Andra
P.S.
The condition
if (_root._currentframe > 1){ doesn't work on a PC
either. It always calls
_root.terug.onRelease(). I can't figure out why...

Woops!! I guess I wasn't paying enough attention...
On a mac using Internet Explorer, both
ExternalInterface.available and
ExternalInterface.addCallback return false. Using the back
button does reload Page A into the Iframe, but doesn't execute any
AS-functions.
Using Safari, they both return true. However, using the back
button reloads the entire index.html instead of loading Page A back
into the Iframe. This means the flash-movie is reloaded aswell, so
you're automatically back at frame 1.
Is there any way I could get this working properly?
Yours,
Andra

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